Nibbling tool



`Maly 22, 1945.

F. P. FORSS NIBBLING r13001.

2 Sheets-Sheet 1 Filed Jan. l0, 1944 Patented May 22, 1945 i UNIT emesso NIBBLmG 'noch Frithiof PL Forss,y Aurora, I1l;A assig'noxfl to: Inde.-

pendentl Pneumatici T0011 @empa-ny; Ghicago,

Ill., acorporationtof Delaware t ApnlicaitiomJanuary, 1,0, leiascrialfNmaiutava..

9Glaiinsi This invention relates(tonniErol/'e111cntssinparte1 able motor. drivenmibblingtools for cutting metal andi-like. sheets 1 The,usefu1ness;.of\electric inni-,m21drivenFnilcblerxs;` of;` asize and4 weightssmallC enough to loe heid; in,-1

anldt onerated by? one; hand is.,1imitcd; iso-cutting' comparatively, thinsheet, sizes, ThisL is due; to,-

fromtho motor to the, plunger sum'ciently strong and='rugged"forthe increased power of'the motorV to-cutfthe,heaviest-sheets. f

` A- further object' ofWmyinvention' is to connectthe cutter ofthetoolt'o the" plunger by; a confnecter having screw Qthfread'ed" connectionrwith `the plunger by a threadioff a relativelysmalllpitcnfor axial aclustmentA of; the cutteri onturningftheM connecter-i relatively to` the@ plunger"v forL settingv thev strokeJ position; of f the cutter witha Vernier-Y like adustment-L. Witl'i- 'respect to the co-acting`` cutting edges-1 on-=the cutter-and the tool casing; respectively, on` assembling-f ther-tool," andL followeing regrinclingI thei cutting edgesv tosharperr1 the;`

same. w

A fmth'eiiobj ectuzoffmyA inventioni isL tofconnect the cutter: to. the 1 connecter. bytinteriittingfmeanst permitting; seectiye; rotative adjustment of the` cutter:l relatively tof4 that connectez-.1 without-,1. dis. tunning: the', axiali adjustment: oi; the; connecten frartimlng thefcutter; intoothefadjusted, positions; ofithes-dlezhead.; c

Atfurthenobjecten-my;invention;isitoxslidahm andtrotatablycmount; the-:cutterfinfthef connectenfor: cngaginaz and* disenaaeine.; saidtintertting;

means f bg? the cutten: anda'r fon; turning: the cutten fonvrotatiye adiustment when; saintinterittine` meansis disengaged.

furthclcobject-l off. my' invention isrto provide- Sliriilgi-mcanstactineton: the cutter for normallyf Eig* L is: a `side rrelevational tvdew of? myg improved:- nbbling, tool;` y i 1i.ig .2r` is? a, verticalsectional. View, with gantsv in'` ele,Vationfl talsieny through. theahead, section au they fronti, ende on theftool t and the adjacenticonnectedi pcntionf. oit the speed. reducing, sectionv to.r show theci-ittcr.y andithee-Plungerandtthef.reciprocatinei drive Yfor 'thel plunger;V Y

Eig; 3.a isi ahoxizontal; sectional, View. taken, ont.

Fsigf, 441s,- a..l similar; se ctitmalf` View taken. Qn, liner: 4+.-4f ofv Fig, 2; to; show the` intertting. connece tong between the cutter and; the.: cQrmCter-.L

Eig., 5'r is. al. verticalA sectiona'Lvievcci;V the.` con:

'inrnccten and` cutter: asscmb1ytthe, cutter): beine,

shown in.` elevation and'. raised to disconnect', the. interittingimeans for,V turning; the c utten fon-rota,- i tive-l adjustment:y

Fig. 6 is a vertical sectional view takenthrougm g,` the motorrand the speedtreducingseotionswheizein,t joined, toi'show, the; adjacent. portionssof; the.

motor and theyoinive,from the v-Inotor to theslflait.l

in .thefspleed reducingfsection;

Fig; 7^: is',l a .vertical sectionaltviow y takennn, line Fig. tistanvertical sectionalY YieWWit-h parts, in.

elevation showing, amodiedfonn,of'interiittin connection between 1.i-.hepconnecten andtheicutterr;1 Ei't 9,?- ist3 a.,horizonta1. sectonalf view. taken` on,M

- linea-"Sto Fig, 8 and:

mnvention compriscsatmotor. section I small enough in` diameter, to 'seri/eras a gription theftool ande containing, a, pneumatic motorl ofI therotaryf` type 2;, a. sneedl reducing, section` 3 mountingY aA shatd havinggan; integral ,eccentric ,portion and.

a` hear-,1l section 6. receiving.` said eccentric` portion,

Egandfmounting aslidable, plunger', it to which the; cuttert 8 oi'i the-toolis connected: Thecutter i;A extends from, the. head, section, 6, throughT the. connectcdnortion Simi14 a ,dieheadA I il. into 7a guide.

headisecton E; may,` b encast,integral?Withthecasing;J off-theg-soeed reducing, section 3-,- and ,thetvalvet section; [3,` at-.therean end. of,` the vtool mayE loev sniilarlyy connected with, the-r casingv of: the lmotorl 11011ing s.c ntcrtting mcansceneagediandnon 511=` section, It.` The; valvesection I,3.mounts,amanue mit;4 disengagement; thereof: onf: movinathe cutten asoinst:thespringttension.

The invention consists further in thegfeatures hereinafter;describediandclairnedr v,Inrtheatccomparnunsfdrawinssc-- ally operable,` spring; biased, throttle Valve (not4 shoiivn)4 having.lr an actuation I4 onthe outside.. oiv the. tool,I for@ controlling` the supply of compressed. cinto-,the tooly motor 2L A fitting I5i connects.

the tool in the valve section I3. The tool sections I, 3 and I3 are suitably connected together lengthwise of the tool with the head section 6 at the front end of the tool and extending laterally to one side thereof.

The die head I is provided with side members I6, I6 engaging the sides of the cutter 8 and a yoke l1 extending about the lower end portion of the cutter 8 and engaging its front and rear faces as shown in Figs. 1 to 3. The front leg of the yoke mounts a stripper screw I8 for supporting the sheet being cut at the throat opening I9 on the front side of the die head I0. plate is secured by screws 2I, .2| to the die head above the yoke and over the front side of the guide-way II as shown. This plate has a cutting edge 22 at its lower inner edge to co-act with a A die or cutter cutting edge 23 on the front side of the cutter 8 at the base of a relief groove 24 in the cutter and which groove connects with an opening 25 in the cutter plate 20 for the discharge of cuttings from the sheet being cut. The cutter 8 cuts'on its up-stroke and the relief groove limits the feed of the sheet between the cuttingedges. The plate 20 is reversible having an-additional cutting edge.

end of the head casing I2in closing relation therewith. Said screws 26 pass through lugs 21, 21 on the die head and engage in openings in the head casing I 2 as shown. The lugs 21 and-the openings inthe head section-Evare spaced 120 degrees apart about the -cuttervaxis and providefor adjustment of the'die head I0 into any one of three positions as indicated by the-broken lines a, bl and cin Fig.

' 3. In position a, the die head is set for a cutting action in line withthe length of the tool, while in positions b or c, the die head is set for cutting operations laterally of and on either side of the tool. 1 i i The cutter 8 is of rectangular bar stock and the opening 28 in the die head I6 and its connected guide-way II are complementary in shape This holds the cutter 8 from rotation in the die head. A connector `29 screws into a-chamber 30 in the plunger 1 for connecting the cutter 8 to the plunger. The lchamber 30 opens through the lower end of the plunger to receive the connecter 29 and the screw threaded connection comprises a thread of relatively Vsmall pitch for a Vernierlike adjustment of the cutter axially of the plunger on turning of the connecter relatively to the plunger. The connecter 29, which is circular,

provides a socket to receive the head portion 3l at the upper end of the cutter 8. Said head portion 3|, in the tool shown in Figs. 1 to 5, has an upper hexagonal portion 32 and a smaller,lower circular portion 33. These respective head portions 32, 33 are received within correspondingly shaped recesses 34, provided in the connecter socket 29. When the parts intert, as shown in Fig. 2, the flat co-acting faces of the hexagonal portions 32 and 34 hold the cutter 8 from rotation relatively to the connecter 29 as shown in Fig. 4. In this position of the parts, the connecter portion 33 seats in its recess 35'and a coiled, expansion spring 36 in the chamber 39 acts on the cutter 8 to normally hold the parts engaged. Pressing the cutter 6 inwardly against the tension of the spring 36 raises the hexagonal portion 32 out of the similarly shaped recess 34 and permits turning the cutter 8 relatively to the socket 29 without disturbing the axial adjustment of the latter. Fig. 5 shows the cutter 8 raised for rotative adjustment.

The circular portion 33 supports the cutter for this rotative movement andthe Screws 26, 26 secure the die head I0 to thelower rectangular portion of the cutter extends through a circular opening 29a at the lower end of the connecter 29 to permit this turning of the cutter. Releasing the cutter 8 allows the spring tension 36 to re-seat the cutter 8 in its connecter recesses 34, 35 and the cutter is held from rotation relatively to the connecter by the interftting flats on the hexagonal portions of the cutter and the connecter, respectively. This hexagonal arrangement provides six selective rotative positions of adjustment of the cutter with respect to the connecter 29.

Turning the connecter 29 in the plunger 1 adjusts the cutter 8 axially for setting the stroke position of the cutter with respect to the co-actng'cutting ledges 22, 23 on the die head IU and the cutter, respectively. This axial adjustment -may be made when assembling the tool and after regrinding the cutting edges to sharpen the same.

The axial adjustment is made after the die head I6 is removed from the tool.

The rotative adjustment of the cutter 8 ismade to position the cutter for entering the guide-way I I in the die head I0 in its various positions of adjustment as provided by the spacing of the lugs. The cutter 8A is also turned to set itin operation position should an axial adjustment displace the cutter with respect to the die head. As before' mentioned, this rotative adjustment of the cutter may be made without disturbing the axial Vadjustment of the cutter and the stroke position of the cutter is maintained. After the adjustments are made the die head I6 is replaced and secured in' place by the screws 26.

The driving connection between the motor 2 and the shaft 4in the tool section 3, in the em-y bodiment shown, comprises a planetary gearing having a sun gear 31 on the rotorshaft 38 of the motor 2, planet pinionsr 39, 39 carried by a head portion of the shaft 4 at the sun gear and a ring gear 46 xed against rotation in the tool section 3. The tool section 3 mounts roller bearings 4I, 4I for the shaft 4 as shown.

The plunger 1V is `connected by a pivot pin 42 with a rigid, one-piece driving rod 43 Ihaving a portion 44 about the eccentric 5 on the shaft 4 as shown in Fig. 2. The rod 43 fits Within the bifurcated upper end of the plunger 1 as shown and the plunger is held from rotation in the head cas-4 ing l2. The driving means shown isrugged and #12 gauge sheet iron as hereinbefore noted.

A modied form of intertting connection between the cutter and its `connecter is shown in Figs, 8 to 10.` Here, the cutter is marked 8a' and the connecter socket is marked 29h. The cutter 8a has a head portion 45 provided with ban upwardly opening cross-slot 46 to receive a croisspin 41 which extends at its opposite ends beyond the cutter to seat in alined slots 48 spaced about the upper edge 'of the connector 2917. 'A coiled spring 49 acts on the cutter 8a to seat the pin 41' in the selected connecter slots 48,' a Washer (not shown) being interposed between the spring and the pin. The pinv41 holds-the cutter against rotation with respect tothe cc'onnecte'rV 29b,but on raising the cutter against the tension of the spring the cutter may be turned to engage the selected slots 48. Six slots 448 are shown to pro'- vide for a like number of adjusted positions for the cutter. 1-

i I2 in a bushing 50cla'mped between lthe upper asterisco:

the spirit. and:` scope. ot. my: invention, except asf.

pointedi out; imthee annexed cl'aims: Vl Lclaimjasgimylinventiona: l 1.;.A\ cutter.l lie-adi the. characterdeseribedl comprising; ay casing. a: .plunger reciprocal'ily.Y mnumtedtthefreini. a. cutter` ban reciprocated'` byc said' plunger; .ai stationary member 'supported by.` the casing, said memberr and; said cutterl having; co-actin'g' cuttingfed'ges; a connecter connecting the cutter to the plunger and having `screw threaded engagement therewith for axial adjustment of the cutter, said cutter having rotative connection with the connecter for rotative "adjustment of the cutter relative to the connecter, interengaging means on the cutter and the connecter for holding the cutter from rotation relative to the connecter in the various positions oi rotative adjustment of the cutter in the connecter, said cutter being movable endwise of the connecter for disengaging said interengaging means for releasing the cutter for rotative adjustment, and means fornormally holding the interengaging means engaged.

2. A cutter head of the character described comprising, a casing, a plunger reciprocably mounted therein, a cutter bar reciprocated by said plunger, a stationary member supported by the casing, said member and said cutter having co-acting cutting edges, a connecter connecting the cutter to the plunger and having screw threaded engagement therewith for axial adjustment of the cutter, said cutter having rotative connection with the connecter for rotative adjustment of the cutter relative to the connecter,

interengaging means on the cutter and the connecter for holding the cutter from rotation relative to the connecter in the various positions of rotative adjustment of the cutter in the connecter, said cutter being slidably mounted in the connecter for disengaging said interengaging means for releasing the cutter for rotative adjustment, and spring means for normally holding the cutter in the connecter and the interengaging means engaged.

3. A cutter head of the character described comprising, a casing, a plunger reciprocably mounted therein, a cutter bar reciprocated by said plunger, a stationary member supported by said casing,`said member and said cutter having co-acting cutting edges, a connecter connecting the cutter to the plunger and having screw threaded engagement therewith for axial adjustment of the cutter, intertting, non-circular, head and socket portions on the cutter and the connecter for holding the cutter from rotation relative to the connecter in the various positions of rotative adjustment of the cutter in the connecter, said cutter being slidably mounted in the connecter for disengaging the head and socket portions for releasing the cutter for rotative adjustment, and spring means acting on the cutter for normally holding said head and socket portions engaged.

4i. Ai. nutten-head1. of," the :character described comprising.. a. casing., ai plunger:-` reciproca-bln mounted therein, a cutter bar reciprocatedi by.. saldi plungezn.` a@ stationary member supported by said:Y casing,1said.member and. said cuttenhaving:`

co-actingi cutting; edges. a connecter'connecting the-cutter: to: the.' plungerzand; having: screw; threadedgengagement therewitlr fion axial adjust-f ment oi?A the,- cutter,- saidz cutter: havingl rotative.

" connection.- withf the connecter. fon rotative ad@ justment; ofi thea cutter: relativer tol the;l connecten: a4 cross-pin and@ circnmerentially spaceda slots; therefor: carried: by the: cutterV and; thef` connecter for: holding the. cutterfrorm rotation relativeitc;

. theaconnecter' in.' the; variousf positions of. rotative.

adjustmentl of'` ther` cutter: ini thev connecten. saidcutter'being sl-idabiymountedin theiconnectenton, disengaging the:r cross-pin: from. the slots for.' rer leasing the cutter for: rotativeA adjustment, andr spring! means acting onk the cutterfor: normally holding the cross-pin engaged in the slots.

5. A cutter head of the character described comprising, a casing, a plunger reciprocably mounted therein, a cutter reciprocated by said plunger, a stationary member supported by said casing, said member and said cutter having coacting cutting edges, a connector connecting the cutter to the plunger and having screw threaded engagement therewith for axial adjustment of the cutter, said cutter having rotative connection with the connecter for rotative adjustment of the cutter relative to the connecter, head and socket portions on the cutter and the connecter for seating the cutter in the connecter, said head and socket portions having engageable hat faces for holding the cutter from rotation relative to 'the connecter in the variouspositions of rotative adjustment of the cutter, said cutter being slidably mounted in the connecter for disengaging said flat faces for releasing the cutter for rotative adjustment, and spring means acting on the cutter for holding the head and socket portions engaged.

6. A cutter head of the character described comprising, a hollow casing having an open end, a plunger reciprocably mounted in said casing, a cutter bar reciprocated by said plunger, a member xedly secured to the casing in closing relation to the open end of the casing, said member and said cutter having coacting cutting edges, a connecter connecting the cutter to the plunger, said cutter and said connecter having rotative connection with the connecter and plunger, respectively, and means for holding the cutter from rotation relative to the connecter in the various positions of rotative adjustment of the cutter, said cutter having anon-circular section and said member having a non-circular opening for passing the cutter for holding the connecter against accidental rotation relative to the plunger. n

7. A cutter head of the character described comprising, a casing, a plunger reciprocably mounted therein, a cutter reciprocated by said plunger, a member xedly supported by said casing and having a cutting edge co-acting with a cutting edge on the cutter, connecting means for connecting the cutter to the plunger and providing for rotative adjustment of the cutter relative to the connecter, releasable holding means for holding the cutter and the connecter from re1- ative rotation in the various positions of rotative adjustment of the cutter, said holding means being disengaged for rotative adjustment of the cutter on movement of the cutter towards the plunger, and means for causing reengagement of said holding means on the outward movement of said cutter. l

V8.1A cutter, head of' the character described comprising, a support, a cutter bar mounted therein, driving means in the support for imparting reciprocable movement to the cutter, said support and the cutter having co-acting cutting edges, means for connecting the cutter to the driving means and enabling rotative adjustment of the cutter relative to the connecting means, means for holding the cutter from rotation relative to the connecter in the various positions of rotative adjustment of the cutter, said cutter beingslidably mounted in the connecting means for releasing the holding means for rotative adjustment of the cutter, and spring means for holding thecutter in the connecting means and the holding means engaged.

9. A cutter head of the character described comprising, a casing, a plunger reciproc'ably mounted therein,v a cutter bar reciprocated by said plunger, a member stationarily secured to the casing and having a cutting edge co-actlng with a cutting edge on the cutter, a connecter connecting the cutter to the plunger, a head p0rtion on the cutter and a. receiving socket therefor in the connecter, said socket having upper and' lower communicating sections, the upper section 

